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Effect of the Cross-Linking with Calcium Ions on the Structural and Thermo-Mechanical Properties of Alginate Films

Published online by Cambridge University Press:  19 July 2011

Turner K. Vidal Urquiza ,
O. Perales Pérez  and
M. Gálvez Saldaña
Turner K. Vidal Urquiza
Affiliation:
University of Puerto Rico, Department of Mechanical Engineering, P.O. Box 9045, Mayagüez, P.R. 00681-9045-9000
O. Perales Pérez
Affiliation:
University of Puerto Rico, Department of Engineering Science & Materials, P.O. Box 9044, Mayagüez, P.R. 00681-9044
M. Gálvez Saldaña
Affiliation:
University of Puerto Rico at Mayagüez, Department of Physics, Mayagüez P.R. 00980
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Abstract

The present research discusses the thermal and structural properties of calcium alginate films synthesized by cross linking precursor sodium alginate films with Ca2+ ions. Raman and FTIR spectroscopy analyses evinced the interchange of Na ions with Ca ions. Both techniques revealed a shift of the COO- vibration modes; the symmetrical COO- peak of calcium alginate exhibited a shift towards higher wavenumber (∼14 cm−1) from 1415 cm−1 to 1429 cm−1 in the Raman spectra. TGA and TMA analyses performed under a nitrogen atmosphere revealed that increasing the Ca-molarity and immersion time resulted in an increase in the glass transition temperature (Tg) and the strain deformation of the Ca-alginate film. The increase in Tg can be attributed to the Ca-cross-linking that could restrict the molecular response to temperature change whereas the increased strain could be due to the enhanced entrapment of water between the molecular chains of the polymer.

Keywords

polymercoatingfilm
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1355: Symposium JJ – Biological Hybrid Materials for Life Sciences , 2011 , mrss11-1355-jj06-16
Copyright
Copyright © Materials Research Society 2011

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References

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